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Either your monitor is bad or the video card inside the computer is bad. To isolate the problem try a different monitor on the computer. Borrow a monitor from a neighbor, friend, relative or co-worker. If the borrowed monitor works, then your original monitor is bad. If the Borrowed monitor does not work, then the video card inside your computer is bad.

Either your monitor is bad or the video card inside the computer is bad.
To isolate the problem try a different monitor on the computer. Borrow
a monitor from a neighbor, friend, relative or co-worker. If the
borrowed monitor works, then your original monitor is bad. If the
Borrowed monitor does not work, then the video card inside your computer
is bad.

Generally an indication that the Hard Drive isn't detected
Things to check, go to BIOS F2, reset defaults and reboot, see if the HDD is seen. If it is, the battery on the motherboard is likely dead and needs replacement (Watch battery at Walmart, 3 dollars)
If the HDD doesn't detect after resetting the BIOS, then most likely a Hard Drive failure

That happened to my Laptop as well and all I did is reinstalled the audio driver that is included in the package and it actually worked with no problem. If in that case is still happening, try to update the driver after reinstalling it.